It’s a trick that orchard growers have used for generations, but not very common among home growers. It’s called Early Season Fruit Thinning, it’s a process in which you pick and discard the small underdeveloped fruits on your tree. You do this because the ones that you leave behind will go on and be bigger, juicier and tastier that they ever would have with so much competition on the tree. It works with apples, pears, apricots, plums, nectarines and grapes. The sooner you get out there and start pruning your fruit from the trees the better.
If you want to learn more about fruit thinning you can find the whole article here.